I believe what our new forum member means is; is can the F-35A stand up against the PAK-FA and J-20.

Btw, welcome, KyoyamaAnna.

All three aircraft are very early in their development stages so such questions are largely debatable on many levels.

Because the development business of F-35 it ends already gradually, it cannot change more。　From first because F-35 is the attack plane, how it does the ability of the fighter plane?